05.JavaScript & DOM 19 décembre 2023 Développement web il3 JavaScript & DOM HE-Arc (DGR) 2022 JavaScript hier • Page web = HTML (+ CSS + JavaScript) • Exécuté par le browser (client) • Interprété Bonnes pratiques15 • Interface pour scripter le navigateur – Accès et modification du contenu via DOM 1https://emscripten.org/ 2http://webassembly.org/ 3http://www.espruino.com/ 4https://nodebots.io/ onsubmit, …) – Embarqués dans les balises (onXXX)

Debugging the BPF Virtual Machine Lorenzo Fontana October 28, 2020 ● Debugging is useful to understand how things work ● Sometimes, eBPF programs can’t even load ● I couldn’t find good resources on this this, so, here I am ● I break lots of eBPF programs ● The BPF Virtual machine is not easy to understand Why ? The BPF subsystem lives in the kernel AND The kernel can be debugged using gdb The

Rud Merriam | A Journey into Non-Virtual Polymorphism 2 Who Doesn’t Recognize This?? 1990 Borland Turbo C++Cppcon 2023 | Rud Merriam | A Journey into Non-Virtual Polymorphism 3 Background ● Experience – Medium.com (https://medium.com/@rudmerriam)Cppcon 2023 | Rud Merriam | A Journey into Non-Virtual Polymorphism 4 Polymorphism ● Greek: “many forms” (Obligatory statement) ● The use of a single variableCppcon 2023 | Rud Merriam | A Journey into Non-Virtual Polymorphism 5 Polymorphic Variables ● Base class pointer to derived class – Virtual functions are not bad! ● Standard Template Library

carePhoto by Tech Nick on unsplashSimple benchmark class Base { public: int concrete() const; virtual int virt() const; }; void benchmark(Base *b, size_t num_iterations) { auto start = Clock::now(); virt_duration = end-start;There are interesting technical details and surprising conclusions that virtual functions can be actually faster. Since CPU architectures are mentioned, I'd expect to see deep nt-vs-inheritance-vs-other- ways-performanceDoes it even matter?Conclusions ● The notion that “virtual functions are slower” is flat out wrong. ○ Which is not to say they are faster ○ Some of the suggested

name, const NodeConfig& config) : SyncActionNode(name, config) {} // You must override this virtual function NodeStatus tick() override { std::cout << "Type: [ApproachEnemy]. Instance:" <<

#IstioCon Is Your Virtual Machine Really Ready-to-go with Istio? Kailun Qin, Intel Haoyuan Ge #IstioCon Quick Summary (from Google Cloud Next ’19 [1]) VM works on Istio! [1] Istio Service Mesh Hybrid and Multi Clouds #IstioCon Istio VM Integration is? A Tumultuous Odyssey… [1] Istio 1.8: A Virtual Machine Integration Odyssey, Jimmy Song #IstioCon V0.2 Mesh Expansion ● Prerequisites ○ IP connectivity the workloads themselves #IstioCon V1.6-1.8 Better VM Workload Abstraction Item Kubernetes Virtual Machine Basic schedule unit Pod WorkloadEntry Component Deployment WorkloadGroup Service registry

#IstioCon Building resilient systems inside the mesh: abstraction and automation of Virtual Service generation Vladimir Georgiev, Thought Machine #IstioCon Sync calls failures inside the mesh implement this to be language agnostic? #IstioCon Virtual Services API ● Solves our problems, but… ● All Service Owners must be aware of the Virtual Services API in order to define their SLOs. ● Potential errors when dealing with YAMLs. ● Potential drift between the state of the service API and the Virtual Service config. ● Hard to manage when having hundreds of services. #IstioCon Abstracting to proto

VueJS. Virtual DOM VueJS makes the use of virtual DOM, which is also used by other frameworks such as React, Ember, etc. The changes are not made to the DOM, instead a replica of the DOM is created latter is compared with the original data structure. The final changes are then updated to the real DOM, which the user will see changing. This is good in terms of optimization, it is less expensive and to the DOM elements to listen to the events in VueJS. Animation/Transition VueJS provides various ways to apply transition to HTML elements when they are added/updated or removed from the DOM. VueJS

@foonathan Express your expectations CppCon 2023-10-03 11JSON DOM parser Jonathan Müller — @foonathan Express your expectations CppCon 2023-10-03 12JSON DOM parser Idea: Represent a JSON value in C++. auto p 2023-10-03 16Problems with JSON DOM parsers json_value is stringly typed, Jonathan Müller — @foonathan Express your expectations CppCon 2023-10-03 17Problems with JSON DOM parsers json_value is stringly allocation, Jonathan Müller — @foonathan Express your expectations CppCon 2023-10-03 17Problems with JSON DOM parsers json_value is stringly typed, which requires dynamic memory allocation, manual error handling

3 Apache Virtual Host documentation 109 3.1 Apache Virtual Host documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110 iii iv CONTENTS 3.2 Name-based Virtual Host Support . . . . . 111 3.3 Apache IP-based Virtual Host Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114 3.4 Dynamically Configured Mass Virtual Hosting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121 3.6 An In-Depth Discussion of Virtual Host Matching . . . . . . . . . . . . . . . . . . . . . . . . . . 129 3.7 File Descriptor Limits